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March 29, 2024, 10:29:48 pm

Author Topic: VCE Biology Question Thread  (Read 3571651 times)  Share 

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geminii

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Re: VCE Biology Question Thread
« Reply #8115 on: September 14, 2016, 01:36:21 pm »
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Hey everyone, so I was doing a practice exam and there is this one question that I cannot seem to understand no matter how many times I come back to it or re-read it.

It's from the VCAA 2014 Biology Exam (Question 34, Multiple Choice)
Trilobites existed from the Early Cambrian period (521 million years ago) until the end of the Permian period (250 million years ago). The chart below, based on fossil evidence, shows the phylogeny of some trilobite orders present in Earth’s oceans over this time.

[Attached image here]

Trilobite fossils in a particular layer of rock were used to date a fossil shell in the same layer. A palaeontologist dated the fossil shell to 328–359 million years old.
It is most likely that the trilobite fossils present were of the order
A. Y.
B. U.
C. Q.
D. T.


Could someone please help explain why the answer is C? :-\

Thanks!
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larissaaa_

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Re: VCE Biology Question Thread
« Reply #8116 on: September 14, 2016, 06:25:07 pm »
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Why is the rate of change that can be achieved through selective breeding slower in traits that are polygenic than those that are monogenic?

sweetcheeks

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Re: VCE Biology Question Thread
« Reply #8117 on: September 14, 2016, 07:13:21 pm »
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Why is the rate of change that can be achieved through selective breeding slower in traits that are polygenic than those that are monogenic?
Polygenic traits are those controlled by several different genes. Monogenetic traits are controlled by a single trait. It is easier to breed an organism for a trait that is monogenetic due to the simplistic nature of only having to account for one gene.

In polygenetic traits it is more challenging to breed an organism with a desired trait as there are multiple genes that have to be selected and creating individuals with all the desired genes takes longer, as it is unlikely that there will be organisms who have all the desired genes, instead over time an organism must be bred to retain the desired genes and gain the ones that it doesn't have. Also factor in heterozygous organisms, who may have a desired and undesired copy of a gene.

vox nihili

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Re: VCE Biology Question Thread
« Reply #8118 on: September 14, 2016, 07:21:34 pm »
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Hey everyone, so I was doing a practice exam and there is this one question that I cannot seem to understand no matter how many times I come back to it or re-read it.

It's from the VCAA 2014 Biology Exam (Question 34, Multiple Choice)
Trilobites existed from the Early Cambrian period (521 million years ago) until the end of the Permian period (250 million years ago). The chart below, based on fossil evidence, shows the phylogeny of some trilobite orders present in Earth’s oceans over this time.

[Attached image here]

Trilobite fossils in a particular layer of rock were used to date a fossil shell in the same layer. A palaeontologist dated the fossil shell to 328–359 million years old.
It is most likely that the trilobite fossils present were of the order
A. Y.
B. U.
C. Q.
D. T.


Could someone please help explain why the answer is C? :-\

Thanks!

There's a lot of useless info in this question, which is there to confuse you.

They dated the fossil to 328-359 million years old. So find these values on the x-axis and see which order existed at that time. You can see that the only one that's still around during that period is order Q, hence C is the answer.
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geminii

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Re: VCE Biology Question Thread
« Reply #8119 on: September 14, 2016, 08:38:07 pm »
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There's a lot of useless info in this question, which is there to confuse you.

They dated the fossil to 328-359 million years old. So find these values on the x-axis and see which order existed at that time. You can see that the only one that's still around during that period is order Q, hence C is the answer.

I did that, but when I looked at the x axis, the time period that 328-359 mya was in was 'Carboniferous.' There are no points in that area, and the closest point to that area is Z, which wasn't an option.
Am I missing something? :o


EDIT:
Oh, wait, I think I get it.. Does the entire line represent when the trilobites were distributed, and not just the letter at the end? If so, I understand how to do it! :)
« Last Edit: September 14, 2016, 08:46:24 pm by geminii »
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vox nihili

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Re: VCE Biology Question Thread
« Reply #8120 on: September 14, 2016, 08:46:25 pm »
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I did that, but when I looked at the x axis, the time period that 328-359 mya was in was 'Carboniferous.' There are no points in that area, and the closest point to that area is Z, which wasn't an option.
Am I missing something? :o

The lines indicate the timeline of that order, so that the line corresponding to Q crosses that era indicates it lived during that era
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geminii

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Re: VCE Biology Question Thread
« Reply #8121 on: September 14, 2016, 08:47:01 pm »
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The lines indicate the timeline of that order, so that the line corresponding to Q crosses that era indicates it lived during that era

Ah, ok, thank you!!
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vox nihili

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Re: VCE Biology Question Thread
« Reply #8122 on: September 14, 2016, 08:48:12 pm »
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Ah, ok, thank you!!

(what you said in your edit is right :))
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larissaaa_

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Re: VCE Biology Question Thread
« Reply #8123 on: September 15, 2016, 07:45:22 pm »
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Can someone list a few differences and similarities of artificial selection and natural selection?

Gogo14

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Re: VCE Biology Question Thread
« Reply #8124 on: September 15, 2016, 09:28:26 pm »
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Can someone list a few differences and similarities of artificial selection and natural selection?
Artifical selection is when humans intervene and selectively breed desired individuals
Natural selection is the natural process of "survival of the fittest" where natural selective pressures result in fit individuals thriving
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Angelx001

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Re: VCE Biology Question Thread
« Reply #8125 on: September 15, 2016, 10:24:00 pm »
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Hey everyone,
Does anyone know whether you have to know about CaCl2 being involved in the heat shock process (when transforming bacteria)?
Thank you!

Angelx001

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Re: VCE Biology Question Thread
« Reply #8126 on: September 16, 2016, 10:28:55 am »
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Is water produced in the light independent reaction? Or is it just glucose, NADP & ADP + pi?

Gogo14

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Re: VCE Biology Question Thread
« Reply #8127 on: September 16, 2016, 08:41:50 pm »
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Is water produced in the light independent reaction? Or is it just glucose, NADP & ADP + pi?
In light dependent
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blacksanta62

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Re: VCE Biology Question Thread
« Reply #8128 on: September 17, 2016, 06:30:14 pm »
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Hey guys, these are some questions I got wrong back in term 2 when completing a practice exam set by the school, any help would be appreciated:
1) Suggest a property of ATP that makes it suitable to its function (1 mark)
2) Why do living things need to undergo production of ATP continuously? (1 mark)
My answer: ATP is required by cells for metabolic activity, without ATP living things would not be able to live
3) Why do plants need to produce ATP in respiration when they produce ATP in photosynthesis? (1 mark)
My answer: ATP produced in photosynthesis is not sufficient like that of aerobic respiration. ATP from the light dependent stage of photosynthesis is also used immediately in the light independent stage.

Did I have to mention 36-38 ATP molecules are produced in aerobic respiration to obtain the mark, or was my answer wrong?
4) Describe two passive plant defences and how each deters pathogens (2 marks)
- Thick cork/bark. Pathogens cannot penetrate out surface of plant (correct)
- Sap. Covers plant openings ensuring pathogens cannot enter plant through openings (wrong)
5) Suggest one active physical plant defence and how it works to deter pathogens (1 mark)
Chemicals and oils secreted by plants which repel vectors of disease (wrong)
6) Why are most protective chemicals produced after the invasion of the pathogen has been detected?
Didn't answer because time was up

Thank you :)
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Angelx001

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Re: VCE Biology Question Thread
« Reply #8129 on: September 17, 2016, 10:14:54 pm »
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Do we need to know about polarisation, depolarisation, repolarisation & hyperpolarisation?
Thanks in advance :)